Girdling is the process by which bark is removed from the entire circumference of a tree or branch. Explain why a
deciduous tree that is completely girdled in mid-summer can retain leaves throughout some or all of the rest of the
growing season, but eventually die.
What will be an ideal response?
ANSWER: The tissue that would be damaged that would ultimately result in the death of the tree is
vascular cambium and secondary phloem. This would prevent sugars produced during
photosynthesis in leaves from reaching the tree’s roots. However, xylem tissue would be
left intact and water would still be available to keep leaf stomata open and leaves turgid.
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Directional selection favors
a. intermediate phenotypes. b. phenotypes at one end of the distribution. c. phenotypic extremes at both ends. d. heterozygotes. e. homozygotes.
Which of the following is a function of the thymus?
a) production of red blood cells b) secretion of antibodies c) production and maintenance of stem cells d) site for the maturation of lymphocytes
In regards to a species' life history, equilibrium species
A. have only a few offspring. B. are short lived. C. reproduce at an early age. D. have a large number of offspring. E. give very little care to their offspring.
Prokaryotes that obtain their energy by oxidizing hydrogen sulfide in volcanic vents are
A. chemoheterotrophs. B. chemoautotrophs. C. photoautotrophs. D. photoheterotrophs.